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[fnordlicht-mini] / firmware / common / pt / lc-switch.h
1 /*
2 * Copyright (c) 2004-2005, Swedish Institute of Computer Science.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the Institute nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * This file is part of the Contiki operating system.
30 *
31 * Author: Adam Dunkels <adam@sics.se>
32 *
33 * $Id: lc-switch.h,v 1.4 2006/06/03 11:29:43 adam Exp $
34 */
35
36 /**
37 * \addtogroup lc
38 * @{
39 */
40
41 /**
42 * \file
43 * Implementation of local continuations based on switch() statment
44 * \author Adam Dunkels <adam@sics.se>
45 *
46 * This implementation of local continuations uses the C switch()
47 * statement to resume execution of a function somewhere inside the
48 * function's body. The implementation is based on the fact that
49 * switch() statements are able to jump directly into the bodies of
50 * control structures such as if() or while() statmenets.
51 *
52 * This implementation borrows heavily from Simon Tatham's coroutines
53 * implementation in C:
54 * http://www.chiark.greenend.org.uk/~sgtatham/coroutines.html
55 */
56
57 #ifndef __LC_SWITCH_H__
58 #define __LC_SWITCH_H__
59
60 /* WARNING! lc implementation using switch() does not work if an
61 LC_SET() is done within another switch() statement! */
62
63 /** \hideinitializer */
64 typedef unsigned short lc_t;
65
66 #define LC_INIT(s) s = 0;
67
68 #define LC_RESUME(s) switch(s) { case 0:
69
70 #define LC_SET(s) s = __LINE__; case __LINE__:
71
72 #define LC_END(s) }
73
74 #endif /* __LC_SWITCH_H__ */
75
76 /** @} */
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